Presentation on theme: "(p,g) reaction via transfer reaction of mirror nuclei and direct measurement of 11C(p,g)12N at DRAGON Bing Guo For nuclear astrophysics group China Institute."— Presentation transcript:
1 (p,g) reaction via transfer reaction of mirror nuclei and direct measurement of 11C(p,g)12N at DRAGONBing GuoFor nuclear astrophysics groupChina Institute of Atomic EnergyThe Sixth China Japan JointNuclear Physics SymposiumMay, 2006Try to avoid too many colorAnd I delete some pages to save the time, only when people ask for detail ,then you can answer.
2 Content (p,g) reaction via transfer reaction of mirror nuclei. 1. Mirror symmetry2. 8Li(d,p)9Li and 8B(p,g)9C3. 26Mg(d,p)27Mg and 26Si(p,g)27PDirect measurement of 11C(p,g)12N at DRAGON.Try to use simple words, not full sentence, to make word larger, and say full sentences.
3 Mirror symmetry A(d,p)B angular distribution If A and C, B and D are mirror nuclei, thenA(d,p)B angular distributionDWBA analysisNeutron ANC of virtual decay B → A + nCharge symmetryProton ANC of virtual decay D → C + p and proton widthBackground is too general, try to use specific words.Radiative capture theoryAstrophysical S-factor and rate of the C(p,g)D reaction
4 Neutron ANC from A(d,p)B is the ANC of d → p + n.is the ANC of B → A + n.L. D. Blokhintsev et al., Sov. J. Part. Nucl. 8, 485 (1977).
5 Proton ANC and width of mirror nucleus D BACKN. Timofeyuk et al., PRL. 91, (2003).
6 8Li(d,p)9Li and 8B(p,g)9C Motivation: 8Li(d,p)9Li is one of important reactions in the inhomogeneous big bang models*, can serve as a surrogate reaction to extract the 8B(p,g)9C and 8Li(n,g)9Li reaction rates for the direct capture.*T. Kajino and R. N. Boyd, Astrophys. J. 359, 267 (1990).
7 Secondary beam facility DipoleGas targetQuadrupolesWien FilterMCP1MCP2ReactionChamberX. Bai et al., NPA 588, 273c (1995).W. Liu et al., NIM B204, 62 (2003).
10 Angular distribution of 8Li(d,p)9Li s=7.9 ± 2.0 mbZ.H. Li, W.P. Liu, X.X. Bai, B. Guo et al., Phys. Rev. C 71, (R) (2005).
11 8B(p,g)9CMotivation:7Be(p,g)8B(p,g)9C(a,p)12N(b+)12C is one of possible alternative paths to 3a process；8B(p,g)9C may play an important role in the evolution of massive stars with very low metallicities.M. Wiescher et al., Astrophys. J. 343, 352 (1989).G.M. Fuller et al., Astrophys. J. 307, 675 (1986).
12 Current status and our proposal on 8B(p,g)9C Several theoretical studies;Proton transfer 8B(d,n)9C reaction by RIKEN;Coulomb dissociation measurement by RIKEN;Knockout reactions of 9C by Texas A&M University and Michigan State University;Neutron transfer 8Li(d,p)9Li reaction and charge symmetry of mirror nuclei.
14 Astrophysical S-factor of 8B(p,g)9C This work presents an independent examination to the existing studies.M. Wiescher et al., APJ. 343, 352 (1989).P. Descouvemont, NPA 646, 261 (1999).P. Mohr, PRC 67, (2003).D. Beaumel et al., PLB 514, 226 (2001).L. Trache et al., PRC 66, (2002).T. Motobayashi, NPA 719, 65c (2003).J. Enders et al., PRC 67, (2003).
15 8B(p,g)9C reaction rate BACK B. Guo, Z.H. Li, W.P. Liu et al., Nucl. Phys. A 761, 162 (2005).
16 26Si(p,g)27P reaction26Al7.4×105 yr5+26MgThe MeV g-ray is an ideal observable for nova and x-ray burst.J. José et al., Astrophys. J. 520, 347 (1999).O. Koike et al., Astron. Astrophys. 342, 464 (1999).
17 Current status and our proposal on 26Si(p,g)27P Several theoretical studies；Measurement of resonant capture via Coulomb dissociation method by RIKEN；No measurement of direct capture；Determination of direct and resonant captures through neutron transfer reaction 26Mg(d,p)27Mg and charge symmetry of mirror nuclei.
23 26Si(p,g)27P reaction rateB. Guo, Z.H. Li, X.X. Bai et al., Phys. Rev. C 73, (2006).
24 More reactions we can do 6Li(d,p)7Li → 6Li(p,g)7Be7Li(d,p)8Li → 7Be(p,g)8B11B(d,p)12B → 11C(p,g)12N12C(d,p)13C → 12C(p,g)13N13C(d,p)14C → 13N(p,g)14O14N(d,p)15N → 14N(p,g)15O……BACK
25 Direct measurement of 11C(p,g)12N at DRAGON Alternative way to the 3a process for transforming material from the pp chains to the CNO.Play an important role in the evolution of Pop Ⅲ stars.Indirect data have large discrepancies.Simple words, and put key reason.
28 Production of 11CISOL approach(500 MeV proton) , successful producing beams such as 8,9,11Li, 21Na.Some difficulty producing beams of volatile elements such as 11C, 13N, 15O and 19Ne in required intensities (~108/s).Larger words.
29 Alternative approach - using 13 MeV proton beam from TR13 Chemical or physical separationTransfer to OLISProductionOLIS ionizationISAC RB
30 Sample radioactivity (mCi) Intensity vs. collection timeBeam of 11C were produced successfully.Beam intensity ~6×108 ions/s when 11C radioactivity of (1 Ci) produced by the TR13 medical cyclotron.Run No.Sample radioactivity (mCi)Beam intensity(ions/s)ECR efficiency115.0 ± 1.5(9.9 ± 0.4) ×106(1.9 ± 0.2) %
31 Conclusions of 11C production Produce 11C (and other isotopes) without using the 500 MeV p+ beam is possible.The beam intensity can meet the needs of radiative proton capture study using DRAGON.The limitation is efficiency of the ion source.Use simple sentences, not copy from article.M. Trinczek, S. Lapi, B. Guo et al., Can. J. Phys., (in press).
32 Research Team of Nuclear Astrophysics at CIAE ExperimentXixiang BaiBing GuoGang LianZhihong LiWeiping LiuJun SuYoubao WangBaoxiang WangTeam membersShengquan YanSheng ZengYongshou Chen Nengchuan ShuKaisu WuTheoretical